Two identical soccer balls are rolled toward each other. what will be true after they collide head on?
a) they will both stop rolling immediately after they collide head on.
b) one ball will stop rolling and the other will roll backward at a slower speed.
c) they will both roll back at the same speed they had before the collision.
d) they will both roll to the side at a faster speed after the collision.

Which of these questions might a character ask if the conflict is man versus self? a. which path should i take to better myself? b. which boulder will be too heavy for me to carry? c. which friend is going to ditch me today? d. all of the above

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?